My amp stopped working the other day. After trouble shooting, the fuse turned out to be the problem...but the fuse isn't blown. The fuse is cutting the voltage by 2-4V. I shake the fuse and there is no rattling. I put it back in and after messing around with it a bit it's working again. It's an agu 80 amp fuse. I'm going to get another one, but I've never seen this before. Is this normal for these heavy agu fuses to go bad over time?